Composite wave-absorbing material and preparation method thereof

A technology of composite wave-absorbing materials and composite materials, applied in the field of composite wave-absorbing materials and their preparation, can solve the problems of limited application range, complex preparation process, narrow frequency band, etc., and achieve excellent wave-absorbing performance, high conductivity, and strong absorption intensity effect

Active Publication Date: 2019-06-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For traditional graphene-based composite absorbers, graphene is usually used as a substrate to support nanoparticles. However, traditional graphene-based composite absorbers still have shortcomings such as narrow frequency bands, low efficiency, and complicated preparation processes, which lead to their application. limited in scope

Method used

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  • Composite wave-absorbing material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The embodiment of the present invention provides the first composite wave-absorbing material, the preparation method of which is as follows:

[0050] (1) Weigh the chemicals used, cobalt dichloride hexahydrate, urea, and ammonium fluoride, with a mass of 3.842g, 3.964g, and 0.977g, respectively, and add them to 330mL of distilled water, and ultrasonically stir for 0.5h-1h to form a uniform dispersion solution. Transferred to a hydrothermal reactor, 120 ° C hydrothermal reaction for 5 h, naturally cooled to room temperature, the obtained product was kept at 350 ° C in an argon atmosphere for 2 h, and then naturally cooled to room temperature to obtain 1.446 g of Co 3 o 4 ;

[0051] (2) will Co 3 o 4 and 8.640 g of Na 2 S was added to 180mL aqueous solution, sonicated for 0.5h-1h to form a uniform dispersion solution, hydrothermally reacted at 120°C for 24h, and then annealed at 500°C for 2h to obtain three-dimensional cobalt sulfide;

[0052] (3) Transfer 100 mg of ...

Embodiment 2

[0057] The embodiment of the present invention provides the second composite wave-absorbing material, the preparation method of which is as follows:

[0058] (1) Weigh the chemicals used, cobalt dichloride hexahydrate, urea, and ammonium fluoride, with a mass of 3.842g, 3.964g, and 0.977g, respectively, and add them to 330mL of distilled water, and ultrasonically stir for 0.5h-1h to form a uniform dispersion solution. Transferred to a hydrothermal reactor, 120 ° C hydrothermal reaction for 5 h, naturally cooled to room temperature, the obtained product was kept at 350 ° C in an argon atmosphere for 2 h, and then naturally cooled to room temperature to obtain 1.446 g of Co 3 o 4 ;

[0059] (2) will Co 3 o 4 and 8.640 g of Na 2 S was added to 180mL aqueous solution, sonicated for 0.5h-1h to form a uniform dispersion solution, hydrothermally reacted at 150°C for 24h, and then annealed at 500°C for 2h to obtain three-dimensional cobalt sulfide;

[0060] (3) Transfer 100 mg of...

Embodiment 3

[0064] The embodiment of the present invention provides a third composite wave-absorbing material, the preparation method of which is as follows:

[0065] (1) Weigh the chemicals used, cobalt dichloride hexahydrate, urea, and ammonium fluoride, with a mass of 3.842g, 3.964g, and 0.977g, respectively, and add them to 330mL of distilled water, and ultrasonically stir for 0.5h-1h to form a uniform dispersion solution. Transferred to a hydrothermal reactor, 120 ° C hydrothermal reaction for 5 h, naturally cooled to room temperature, the obtained product was kept at 350 ° C in an argon atmosphere for 2 h, and then naturally cooled to room temperature to obtain 1.446 g of Co 3 o 4 ;

[0066] (2) will Co 3 o 4 and 8.640 g of Na 2 S was added to 180mL aqueous solution, sonicated for 0.5h-1h to form a uniform dispersion solution, hydrothermally reacted at 180°C for 24h, and then annealed at 500°C for 2h to obtain three-dimensional cobalt sulfide;

[0067] (3) Transfer 100 mg of th...

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Abstract

The invention belongs to the technical field of wave-absorbing materials, and particularly relates to a composite wave-absorbing material and a preparation method thereof. The preparation method of the composite wave-absorbing material comprises the steps: (1) dissolving a cobalt source, urea and ammonium fluoride in water, performing a hydrothermal reaction, and performing cooling and high temperature annealing so as to obtain Co3O4; (2) dissolving Co3O4 and sodium sulfide in water, performing a hydrothermal reaction, and then carrying out high temperature annealing so as to obtain three-dimensional cobalt sulfide; (3) mixing the three-dimensional cobalt sulfide and a modifier aqueous solution, and performing modification so as to obtain modified three-dimensional cobalt sulfide; (4) compounding the modified three-dimensional cobalt sulfide and a graphene oxide aqueous solution so as to obtain a primary cobalt sulfide/graphene oxide composite material; and (5) performing heating reduction on the primary cobalt sulfide/graphene oxide composite material, and performing drying so as to obtain the composite wave-absorbing material. Through the preparation method, the technical defectsof a narrow frequency band, low efficiency and a complicated preparation process of a traditional graphene-based composite wave-absorbing material are overcome.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a composite wave-absorbing material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of science and technology, electronic equipment and communication facilities can be seen everywhere, closely connected with our lives, but its serious electromagnetic radiation has also become a source of pollution that we cannot ignore, not only causing harm to the human body, but also Industrial manufacturing has posed a huge obstacle. The problem of electromagnetic radiation has become another major pollution problem after water pollution and air pollution. Electromagnetic wave absorber (wave absorber) is a functional material that can effectively solve electromagnetic pollution, absorb electromagnetic waves, and reduce electromagnetic wave reflection and transmission. An ideal electromagnetic wave absorb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
Inventor 严成结张海燕张丹枫曾国勋
Owner GUANGDONG UNIV OF TECH
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